On the top panel of Fig. REF , the comparison is carried
out against the Padova PARSEC isochrones [1]}, [2]}, [3]}. It provides evidence that the
new SySt are all located close to the tip of the Giant Branch, and that they
are relatively old and metal poor objects. This conforms with their
significant height \(z\)  above the Galactic plane as given in
Table REF . For that age and metallicity, their mass estimated
from the isochrones ranges from 1.03 to 1.22 M\(_\odot \) . Similar conclusions
are drawn by comparison with the observed isochrones compiled by
[4]} for a sample of clusters spanning a large range
of observed metallicities, as illustrated in the bottom panel of
Fig. REF .
